Entwicklung einer Softwareumgebung zur automatischen Auslegung von hydraulischen Maschinen mit dem Inselmodell

Tismer, Alexander

doi:10.18419/opus-11091

Cited by 2 publications

(1 citation statement)

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“…To determine the influence of numerical versus geometrical input parameters, a sensitivity study is presented in this paper focusing on the structural mechanical analyses of hydraulic machines. All process steps (creating and meshing the geometry, simulation and post-processing for flow and stress analysis) are fully automated using the object-oriented in-house design tool dtOO [2] extended by the tools for the structural mechanical analyses.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity study of numerical and geometrical parameters for structural mechanical analyses in the automatic design process of hydraulic machines

Fraas

Tismer

Riedelbauch

2022

IOP Conf. Ser.: Earth Environ. Sci.

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In the present paper a sensitivity study of numerical and geometrical parameters related to structural mechanical analyses of a hydraulic machine is presented. The sensitivity study is carried out for the blades of two different hydraulic machines, a propeller blade of a submersible vehicle and a runner blade of a kinetic river turbine. The focus of this work is on static structural mechanical analyses, which are performed with the open source finite element program CalculiX. Parameters for the sensitivity study are numerical parameters like the global mesh size as well as the local mesh refinement at certain locations of the blade. Furthermore, the sensitivity of geometrical parameters such as the blade thickness at different locations or the shape of the fillet is investigated. The results of the sensitivity study show that the numerical parameters have a small influence compared to the geometrical parameters. The most dominant geometrical parameter is the blade thickness at the hub. In case of a high load due to the centrifugal force, the influence of the blade thickness at the tip of the blade increases.

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Section: Introductionmentioning

confidence: 99%

Sensitivity study of numerical and geometrical parameters for structural mechanical analyses in the automatic design process of hydraulic machines

Fraas

Tismer

Riedelbauch

2022

IOP Conf. Ser.: Earth Environ. Sci.

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Multidisciplinary optimization of an axial turbine

Fraas,

Tismer,

Riedelbauch

2024

IOP Conf. Ser.: Earth Environ. Sci.

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The results of three different optimization setups for an axial propeller turbine consisting of a guide vane, a runner and a draft tube are presented. The first setup only contains the efficiency as objective and the design head as a constraint. In the second setup, the minimization of the cavitation volume is added as a further objective while in the third, the compliance with a permissible stress is included as an additional constraint. Three operating points are simulated during the optimization. Comparing the results of the first two setups, the minimization of the cavitation volume leads to a lower plant efficiency at all operating points. Including structural mechanical aspects results in a further decrease of the plant efficiency at all operating points. Nevertheless, none of the best individuals from the setups have a maximum von Mises stress below the permissible stress without taking the structural stress limits into account. This points out the importance of considering both, structural as well as fluid mechanical aspects in the optimization process of hydraulic machines.

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Entwicklung einer Softwareumgebung zur automatischen Auslegung von hydraulischen Maschinen mit dem Inselmodell

Cited by 2 publications

References 0 publications

Sensitivity study of numerical and geometrical parameters for structural mechanical analyses in the automatic design process of hydraulic machines

Sensitivity study of numerical and geometrical parameters for structural mechanical analyses in the automatic design process of hydraulic machines

Multidisciplinary optimization of an axial turbine

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